Question

If a researcher is conducting a two independent samples t test, what information is needed from the population to calculate the t statistic?

a. You must know the population mean

b. You must know the population variance or standard deviation

c. You must know the population mean and the variance or standard deviation

d. The t statistic does not require any information about the population

Answer 1

d. The t statistic does not require any information about the population.

Explanation:

For the two sample t test for the difference between two population means, we don’t need any information from the both populations. Although there is a difference between two population means, we don’t need to know the population means for the calculation of test statistic value. We need population variances when we use the z test for difference between two population means.